Surface test indicator



Dec. '16, 1952 G, C, WELCH 2,621,413

SURFACE TEST INDICATOR Filed Sept. 4, 1,9 51

JN VENTDR EE RALD E. WBLEH TTURNEY Patented Dec. 16, V1952 fUN-ITED ,STATES PA'IIEINT OFFICE SURFACEk `TEST INDICATOR Gerald c. Welch, Rochester, N. Y.

Application September 4, 1951, Serial No. 245,054

This invention relatesto surface test indicat'ors,l and more str'uctiontherefor. In an application Serial'No. 119,626, iiledy October 5, 1949, there is disclosed a double face surface vtest indicator having enclosed dials anda wide indicator range. The present invention relates to improvements in the casing construction for such indicators, and the crystal mountings therefor. The improvements have to do withY the provision of amore rugged casing, and a casing the main members of which are produced from a single die.' K a' A f The above and other novel features of the invention will appear more fully hereinafter from the following detailed description when taken in conjunction with the accompanying drawings. AIt is expressly understood that-,the drawings are employedfor purposes` of illustration only'and arenot designed as a definitionfof the limits of the invention, reference being had for this purpose to the appended claims.

In the drawings, wherein like referencecharacters indicate like "parts:

Figure 1 is a plan view of the surface testv indicator;

Figure 2 is a plan of the surface test indicator with one side casing member removed;

Figure v3 is a4 longitudinal sectional view taken Figure 4 is a view of the dial fromthe *reverse` 30 substantially on the line 3-3 of Figure 2;

side; and i Y Figure 5 is an exploded perspective view ofthe frame elements in assembly relation ton one another. a v

Referring to the drawings, there is shown in Figures 1 to 3, a surface test indicator (twice normal size), the frame or casing of which comprises a top and bottom plate I0 and I2, respectively, and an intermediate plateI4, of the V4same, or slightly greater thickness. The top and bot-` tom plates I0 and I2 constitute cover plates,h and together with the intermediate plate I4, which is cut out as at I6, provides a housing for the actuating and pointer mechanism. i

Each of the top and bottom plates comprise a tapered arm portion `Land an annular bezel frame or ring 20. The ring 20 is providedwwith an annular shouldered recess 22 for receiving the peripheral edge of the convex :bezel 24.

The intermediate plate I4, by reason of the cut out portion I6, provides space for the actuating arm 26, pointer 28, and bias spring 29. 'I'he intermediate plate has an annular frame orring portion, discontinuous by reason of the cutout portion I6, adapted to support a circular dial particularly to, a casing "con-A Y 4 Claims. (Cl. 33-172) disk 30. Thering is provided with a shouldered,- annular recess 32upon which the dial disk is seated,vv such Vrecess having suicient depth so that the'diahwhen fseated,l is centered with'vref spect"v tothe upper and lower surfaces 34 and 36 of the'intermediate member. The diameter of the dial-receiving recess 32 is slightly lessv'than the-bezel-receiving recess 22, so that the intermediate plate acts in'conjunction with the cover plates to form a Adeep annular groove for receive ing the-edges of thebezels. The dial is staked in place by points 38 sheared from the frame. n

The cover and intermediate plates are secured together by screws 40, the heads of which are countersunk inthe plate I 0 and the Shanks of which are threaded in the plate I2,vsuch screws passing through corresponding apertures inthe intermediate plate I4. The outer plates IIZIV and` I2 are also secured together by` screws 42 and. 44,v which form pivots for thev actuating lever 26 and pointer 28, respectively. d

As described `in the4 copending application hereinabove referred to, the actuating lever 26 is frctionally held in the bifurcated end 46 of the ball arm member 48, which ball arm member is freely pivoted on the screw 42. The "friction is developed by the-resiliency of the folded-over portion 50 of the actuating arm or by a resilient'` dished spacer. p The free end of the actuating arm is provided with spaced fingers 52 and 54 riding on `pins 56 `and 58 on theA pointer'.f..'1he` hair spring 29 rides on the pin 56, and is secured atits other end in afslit in the bottom plate', as at 58jsuch slit being-swaged closed after insertion of the spring'.

. The ball 60is spherical, and of a diameter equal tov or less than the root ,diameter of the threads 62, whereby a larger spherical yball mem.` ber 64, having an internally threadedxcollar 66,` maybe positioned over the ball 60,*the collar having a `shoulder 68 adapted to abut a shoulder 10 at the base of the threads 62, whereby the ball 64 will be concentric with the ball 60 when screwed on the threads 62, withthe shoulders 68' and I0 abutting. f Thev bottom plateV may be provided' with a mounting stud as shown in the above referred-tovv application, or if desired, the intermediate plate thereto by a, thumb screw, or the aperture 11 in the arm threaded, and the thumb screw extended through the aperture 13.

The dial is lettered on opposite sides reversely. so that the indicator can be read from either side, and for this purpose, the pointer 28 is duplicated on opposite sides of the dial, as at 3| and 33, the pointer 3l :being offset as at 35 to clear the dial. Both pointers are secured together by the collar 31 and the pins 55 and 58.

It will be seen that the indicator frame plates are of similar shape, and may be cut from heavy sheet stock by a single die, it being necessary, if the extension 'l2 on the intermediate plate is provided, to cut away such extension in preparing the cover plates I and I2, and to cut away the central portion I6 of the intermediate plate i4. The parts as thus out may thereafter be nished by turning the respective shouldered recesses 22 and 32 in a lathe operation. The entire assembly-,.however, provides a practically indestructihle casing, with deep bezel grooves whereby the indicator is protected from dirt and grime usually present in machine` shops, where the indicator is generally used. The construction is such as to provide a wide angle scale. for ease in reading indications thereon. While a convenient size has been indicated which wouldl comprise the parts of the size as actually shown in Figure 5, and in which the plates are in the order of fg" stock, the outer plates being slightly less, such size ismerely referred toas an example to indicate the compactness, ruggedness, and simplicity of the structure as a whole.

Although a single embodiment of the invention has been illustrated and described, it is to be understood that the invention is not limited thereto. As various changes in the construction and arrangement may be made without departfrom the spirit of the invention, as will be apparent to those skilled. in the art, reference will beV had to the appended claims for a. dennition of the limits of the invention.

What is claimed is:

'1. In a surface test indicator, a housing comprising three nat plates having similar exterior contour, each comprising an arm portion, and an enlarged substantially annular indicator dial portion, means for securing said plates together,` the outer plates comprising top and bottom covers and the intermediate plate being cut away tc provide spaced side walls for said arm portions and a cavity forindicating and actuating mechanism, the annular portion of said outer plates having an inwardly directed annular shouldered recess for receiving a bezel, circular bezels having their peripheral edges mounted in said recesses, and the annular portion ofA the intermediate plate having an annularA shouldered recess, the diameters of which are less than the diameters of said bezel recess, a circular dial seated in said intermediate plate recess, an indicator member having pointers extending in parallel spaced relation on opposite sides of said dial, and pivoted on the arm portions of said cover plates, and indicator actuating means' projecting outwardly from the end of the arm, and pivoted on the arm" portions of said cover plates adjacent the end' thereof, said actuating means having a member adapted to engage-said indicator for actuation thereof.

2. In a surface test indicator, a housing comprising three iiat plates having similar exterior contour, each comprising an arm portion, and an enlarged substantially annular indicator dial portion, means for securing said plates together, the outer plates comprising top and bottom covers and the intermediate plate being cut away to provide spaced side walls for said arm portions and a cavity for indicating and actuating mechanism, the annular portions of each of said outer plates having an inwardly directed annular shouldered recess for receiving a bezel, circular bezels having their peripheral edges mounted in said recesses, and the annular portion of the intermediate plate having an annular shouldered recess, the diameters of which are less than the diameters of said bezel recess, a circular dial seated in said intermediate plate recess, an indicator member having pointers extending in parallel spaced relation on opposite sides of said dial, and pivoted on a screw extending through and normal to the arm portions of said cover plates, and indicator actuating means projecting outwardly from the end of the arm, and pivoted on a screw extending through and normal to the arm portions of said cover plates adjacent the end thereof, said actuating means having a member adapted to engage said indicator for actuation thereof. y

3. In a surface test indicator, a housing corn-y prising three flat plates having similar exterior contour, each comprising an arm portion, and an enlarged substantially annular indicator dial portion, means for securing said plates together. the outer plates comprising top and bottom covers and the intermediate plate being cut away to provide spaced side walls for said arm portions and a cavity for indicating and actuating mechanism, the annular portions of each of said.

outer plates having an inwardly directed annular shouldered recess for receiving a bezel, circular bezels having their peripheral edges mounted in said recesses, and the annular portion of the. intermediate plate having an annular shouldered recess of a depth slightly greater than half the plate thickness, the inner and outer diameters of which shoulders are less than the diameters of said bezel recess, a circular dial seated in said intermediate plate recess and secured therein by pins sheared from the recess wall, an indicator :member having pointers extending in parallel spaced relation on opposite sides of said dial, and pivoted on a screw extendingv through and normal to the arm portions of said cover plates, and indicator actuating means projecting outwardly 1 from the end of the arm, and pivoted on a screw extending through and normal to the arm portions of said cover plates adjacent the end there of, said actuating means having a member adapted to engage said indicator for actuation thereof, said means for securing said plates together comprising said screw pivots, and screws extending through the annular portions adjacent the peripheral edges thereof.

4. An indicator in accordance with claim 1,*in which the intermediate plate is provided with an apertured extension portion extending beyond the marginal edges of the cover plates superimposed thereover.

GERALD C. WELCH.

No references cited. 

